/*
 * Copyright 2021 Shulie Technology, Co.Ltd
 * Email: shulie@shulie.io
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.shulie.surge.data.runtime.disruptor;

/**
 * An aggregate collection of {@link EventHandler}s that get called in sequence for each event.
 *
 * @param <T> event implementation storing the data for sharing during exchange or parallel coordination of an event.
 */
public final class AggregateEventHandler<T>
		implements EventHandler<T>, LifecycleAware
{
	private final EventHandler<T>[] eventHandlers;

	/**
	 * Construct an aggregate collection of {@link EventHandler}s to be called in sequence.
	 *
	 * @param eventHandlers to be called in sequence.
	 */
	public AggregateEventHandler(final EventHandler<T>... eventHandlers)
	{
		this.eventHandlers = eventHandlers;
	}

	@Override
	public void onEvent(final T event, final long sequence, final boolean endOfBatch)
			throws Exception
	{
		for (final EventHandler<T> eventHandler : eventHandlers)
		{
			eventHandler.onEvent(event, sequence, endOfBatch);
		}
	}

	@Override
	public void onStart()
	{
		for (final EventHandler<T> eventHandler : eventHandlers)
		{
			if (eventHandler instanceof LifecycleAware)
			{
				((LifecycleAware) eventHandler).onStart();
			}
		}
	}

	@Override
	public void onShutdown()
	{
		for (final EventHandler<T> eventHandler : eventHandlers)
		{
			if (eventHandler instanceof LifecycleAware)
			{
				((LifecycleAware) eventHandler).onShutdown();
			}
		}
	}
}
